Barry Allen never officially appears in the DCAU series of animated projects by Bruce Timm and Paul Dini. However, in the Justice League Unlimited episode "Flash and Substance", the Flash (Wally West) mentions his uncle "flying in" to attend the dedication of a Flash Museum, an obvious reference to Barry. There's also another character on the same episode, who is Wally's teacher at the forensic lab, who bears strange resemblance to Barry himself. The episode also featured the three-break Flash logo, which Barry Allen is known for, alongside Wally's two-break lightning bolt logo.
Barry Allen as the Flash appears in Super Friends.
Barry Allen as the Flash appears in Justice League: New Frontier.
Barry Allen appears as the Flash in Batman: The Brave and The Bold portrayed as having 'died' in a battle with Professor Zoom. The original Flash, Jay Garrick and Kid Flash (Wally West) team up with Batman when they encounter the 'ghost' of Barry Allen. They attempt to trace the ghost's signature and discover that Zoom has lured Flash into the future where he now rules and that he's been siphoning off Barry's speed force energy. In 'Brave and the Bold', the most recent Flash is Barry.
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